Geographical clock.



No. 693,953. Patented Feb. 25,1902. c. E. DAVIS.

GEOGRAPHICAL CLOCK.

(Applicfl'xon filed May 23. 1900.!

(N o M 0 d e I \lllllll CHARLES DAVIS, OF NEW YORK,

-. ATENT FFICE.

N. Y., ASSIGNOR OF ONE-THIRD TO HENRY D. I-IARROWER, OF NEW YORK, N. Y.

GEOGRAPHICAL CLOCK.

SPECIFICATION forming part of Letters Patent No. 693,953, dated February 25, 1902.

I Application filed May 23,1900. Serial No. 1 7,624. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES E. DAVIS, a

citizen of the United States of America, and

a resident of New York, county and State of New York, have invented certain new and useful Improvements in Geographical Time pieces, of which the-following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in geographical timepieces; and it consists, primarily, in the provision of two disks adapted to be mounted upon the hour-sleeve of time mechanism, the one adapted to revolve in unison with the hour-sleeve upon which it is mounted and the other to be relatively stationary. Upon the relatively movable disk the names of various countries and some of the principal cities throughout the world are denoted, as are also degrees of longitude, and upon the relatively stationary disk are denoted characters representing the hours of the day and night.

My invention further consists in constructing the said disks of transparent or translucent material and in providing illuminating means behind said disks whereby the same may be illuminated.

The objects of my invention are, first, to produce a simple and effective'geographical timepiece; secondly, to provide geographical time-disks and'simple mechanism which may be easily and readily fixed to an ordinary clock as now in every-day use, and, thirdly, to provide a means for illuminating the same, whereby the time in any portion of the globe may readily be ascertained either in the daytime or night.

My invention further consists in certain novel details of construction and combination of parts, as shall hereinafter be more fully set forth.

I will now proceed to describe my invention with reference to the accompanying drawings and will then point out the novel features in the claim.

In the drawings, Figure l is a face view of a geographical timepiece embodying my invention. Fig. 2 is a side elevation of the same with the inclosing caseinsection. Fig.

3 is a detail cross-section, on an enlarged scale, showing the method of supporting the relatively stationary disk. Fig. 4 is a detail view showing the method of supporting the relatively movable disk.

Similar reference characters represent corresponding parts throughout the several views.

Reference character 5 designates an outer frame or casing, and 6 a clock mechanism of well-known or any desired construction. The minute-arbor 7 thereof extendsforwardly, and upon this minute-arbor is mounted the minute-hand 8. p

I have not shown in detail the actuating mechanism, gear train, escapement, &c., which go to make up the mechanism of a timepiece, as such form no part of this invention, one of the features of this invention being that the geographical time-disks are adapted to be mounted upon any of the ordinary forms of timepieces now existing. It is desirable, however, that the timepiece shall have a twenty-four-hour dial and not a twelvehour, as is more common. It, therefore, the timepiece is of such character as to give two complete revolutions of the hour-hand in twenty-four hours, or, in other words, is a twelve-hour timepiece,,I preferably so change and arrange the gearing as to cause the hourhand to make but one revolution in the twenty-four hours. Gearing corresponding to gears 9 1O 11 12, as shown in the drawings, are in all timepieces, whether 'twelve or twenty-four hour timepieces. Toconvert a timepiece, therefore, from a twelve-hour to the tWenty-four-hour timepiece it is only necessary to slip the gear-wheel 12, which is mounted fast upon that which is known as the hour-sleeve and which is here designated by the reference character 13, oi the minute-arbor 7 and to remove the pinion and spur gears 11 and 10 off the stud upon which they are loosely mounted. Gears having the correct relationship may then be substituted wherebya single revolution of the hour-sleeve 13 will take place in every twenty-four hours. The hour-sleeve 13 is loosely mounted upon the minute-arbor 7 and revolves upon it, but independently thereof, the relationship of IOO speed being determined by the gears 12, 11, 10, and 9. The gear 9 is keyed or otherwise secured to the minute-arbor 7.

A disk 14 is provided, and upon the outer face of the disk is denoted names of various cities and countries throughout the world. Degrees of longitude are also denoted thereon. The disk 14 is secured to rotate with the hoursleeve 13, the hour-sleeve being preferably provided with a projection or key 15 and the disk 14 with a corresponding keyway 16. The hour-hand 17 is secured to rotate with the disk 14, preferably by securing the point thereof to the disk by means of a small loop or staple 22, as shown. The ordinary way of securing the hour-hand to its sleeve is by friction of the hub; but in this case such method of securing the same would not be desirable, for the reason that it is highly essential that the hour-hand 17 should absolutely maintain its correct relative position with the disk 14. The hour-hand 17 is secured to the disk 14 opposite the pointat which the name of the city or country in which the clock is located is denoted.

A second disk 18 is mounted loosely upon the hour-sleeve 13 and is adapted to remain relatively stationary thereon while the said sleeve is revolving. The disk 18 is provided with a Weight 19, which acts by gravity to maintain the disk in its correct position. The disk 18 is thus mounted upon the sleeve 13, but in no Way partakes of its movement. A hole 20 is located in the disk 18 at about 0pposite the winding-arbor of the timepiece, and through this hole a key is adapted to be inserted for the purpose of winding up the timepiece.

The disk 14 has that portion which is located-behind the relatively stationary disk 18 largely cutaway, as at 23, in order that said disk in its rotation shall obscure the windingstem as little as possible. It is only at such times as the non-cut-away portions of the said disk are passing in front of the said arbor that access thereto with the key is pre vented.

I preferably make the disks 14-and 18 of transparent or translucent materia1-such, for instance, as ground glassand upon the surface of the transparent or translucent material I denote the names of countries or cities and degrees of longitude, hours of the day, 850. This may be done by printing or otherwise producing them on the surface of the disk with an opaque material. I further arrange for an illumination, as by means of lamps 21, which I locate behind the disks and Within the frame or casing 5. In this way I provide a geographical timepiece bywhich both at day or night I am enabled at a glance to tell the'time not only in the city or country in which I am residing, but simultaneously all over the world.

Around the outer edge of the lower half of the disk 18 I preferably arrange a dark band or background for the hours of the night from six p. m. to six a. m. In this manner the fact as-to whether the time denoted is day-time or night-time in any portion of the world is readily and instantly observable.

It will be noted that though I may employ my invention in combination with a speciallyconstructed timepiece my invention is particularly adapted to application with timepieces of any ordinary construction.

What I claim is- The combination with the revoluble hoursleeve of a time mechanism, of a geographical disk and an hour-indicating hand secured together at their respective hubs by both being fixedly mounted upon the said hoursleeve, and further connected together by the outer end of the indicating hand being secured to the face of the disk, and a second disk loosely mounted upon the said hoursleeve between the said first-named disk and the indicating-hand, and held relatively stationary in such position.

CHARLES E. DAVIS.

Witnesses:

D. HOWARD HAYWOOD, EMIL JAooBs. 

